Clock not working ???

have a 89 L sedan .. and everything works great inside of it ... everything except the clock. It comes on whenever it wants and goes out all the same .. sometimes i go for a drive and it doesn't come on at all.

had a bad alternator a and the battery died .. but the clock was going wild even before then

replaced the battery,alternator, and put a new 2Ga ground wire on the battery this week, and even tho my lights are brighter than ever and car starts faster, the clock just wont seem to give me the time of day (no pun intended)

HELP! lol